CN114520300B - Display panel and display device - Google Patents
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- CN114520300B CN114520300B CN202210006619.8A CN202210006619A CN114520300B CN 114520300 B CN114520300 B CN 114520300B CN 202210006619 A CN202210006619 A CN 202210006619A CN 114520300 B CN114520300 B CN 114520300B
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- H10K50/00—Organic light-emitting devices
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- H—ELECTRICITY
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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Abstract
The display panel and the display device provided by the embodiment of the invention comprise a display light-transmitting area and a main display area arranged outside the display light-transmitting area, wherein the display panel comprises an array substrate and an OLED light-emitting device arranged on the array substrate, and the OLED light-emitting device comprises an anode, a light-emitting functional layer and a cathode which are sequentially laminated on the array substrate; the thickness of the cathode in the display light transmission area is different from that of the cathode in the main display area. The cathode thickness of the display light-transmitting area and the cathode thickness of the main display area are subjected to differential design, so that the microcavity cavity length of the sub-pixels of the display light-transmitting area is optimal, the luminous efficiency of the sub-pixels of the display light-transmitting area is improved, and the brightness life of the display light-transmitting area is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
OLED (Organic Light Emitting Diode ) display technology is paid attention to by more and more scientific researchers, and is widely applied to the display fields of mobile phones, flat panels, televisions and the like, and with the rapid development of display equipment, the requirements of users on the screen ratio of the display equipment are higher and higher, so that the large-size and high-resolution comprehensive display equipment becomes a future development direction.
In the prior art, in order to increase the screen ratio as much as possible, optical elements such as a front camera and face recognition are usually arranged under the screen, and for smart phone service, it can be inferred that a large-size and high-resolution comprehensive screen is a development direction of a future mobile phone screen. In order to increase the screen ratio as much as possible, it is a future development of display technology to provide optical elements such as a front camera and face recognition under the screen. In the prior art, in order to increase the light transmittance of the under-screen camera area, many mobile phone screen manufacturers adopt a method of reducing PPI (Pixels Per Inch). However, another problem is derived, and as PPI decreases, the current density of the sub-pixels in the under-screen camera area increases to reduce the lifetime of the under-screen camera area and affect the display quality in order to achieve the same brightness requirement as that of the normal display area.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for solving the technical problems that the current density of sub-pixels of an under-screen camera area needs to be increased along with the current density of the sub-pixels of the under-screen camera area by reducing the PPI of the under-screen camera area so as to influence the service life of the sub-pixels of the under-screen camera area.
In order to solve the problems, the technical scheme provided by the invention is as follows:
the embodiment of the invention provides a display panel, which comprises a display light-transmitting area and a main display area arranged outside the display light-transmitting area, and comprises:
an array substrate;
the OLED light-emitting device is arranged on the array substrate and comprises an anode, a light-emitting functional layer and a cathode which are sequentially laminated on the array substrate; wherein,,
the thickness of the cathode in the display light transmission area is different from the thickness of the cathode in the main display area.
In some embodiments of the present invention, the OLED light emitting device includes a plurality of sub-pixels located in the main display area and the display light transmitting area, wherein the thickness of the cathode corresponding to the sub-pixels located in the main display area is equal, and the thickness of the cathode corresponding to at least part of the sub-pixels located in the display light transmitting area is smaller than the thickness of the cathode corresponding to the sub-pixels located in the main display area.
In some embodiments of the present invention, the plurality of sub-pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, which are located in the display light-transmitting area and the main display area and have different light emission colors, a thickness of the cathode corresponding to the first sub-pixel located in the display light-transmitting area is the same as a thickness of the cathode corresponding to the first sub-pixel located in the main display area, and a thickness of the cathode corresponding to the second sub-pixel and/or the third sub-pixel located in the display light-transmitting area is smaller than a thickness of the cathode corresponding to the first sub-pixel located in the main display area.
In some embodiments of the present invention, the thickness of the cathode corresponding to the second sub-pixel and/or the third sub-pixel located in the display light-transmitting area is 13-15 nm.
In some embodiments of the present invention, the thickness of the cathode corresponding to the third sub-pixel located in the display light-transmitting region is smaller than the thickness of the cathode corresponding to the second sub-pixel located in the display light-transmitting region.
In some embodiments of the present invention, the thickness of the cathode corresponding to the third sub-pixel located in the display light-transmitting region is 9 to 13 nm, and the thickness of the cathode corresponding to the second sub-pixel located in the display light-transmitting region is 13 to 15 nm.
In some embodiments of the invention, the cathode includes a plurality of openings between adjacent ones of the subpixels within the display light-transmitting region.
In some embodiments of the invention, the light transmittance of the display light transmission region is greater than the light transmittance of the main display region.
In some embodiments of the present invention, the area of the anode corresponding to the sub-pixel of the display light-transmitting region is smaller than the area of the anode corresponding to the sub-pixel of the main display region.
The embodiment of the invention also provides a display device, which comprises the display panel in any embodiment and an optical element positioned on the backlight side of the display panel, wherein the optical element is arranged corresponding to the display light transmission area of the display panel.
The beneficial effects of the invention are as follows: the display panel and the display device provided by the embodiment of the invention comprise a display light-transmitting area and a main display area arranged outside the display light-transmitting area, wherein the display panel comprises an array substrate and an OLED light-emitting device arranged on the array substrate, and the OLED light-emitting device comprises an anode, a light-emitting functional layer and a cathode which are sequentially laminated on the array substrate; the thickness of the cathode in the display light transmission area is different from that of the cathode in the main display area. The cathode thickness of the display light-transmitting area and the cathode thickness of the main display area are subjected to differential design, so that the microcavity cavity length of the sub-pixels of the display light-transmitting area is optimal, the luminous efficiency of the sub-pixels of the display light-transmitting area is improved, and the brightness life of the display light-transmitting area is improved.
Drawings
Fig. 1 is a schematic plan view of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic layout diagram of sub-pixels for displaying a light-transmitting area according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a film stack structure of a main display area according to an embodiment of the present invention;
FIG. 4 is a schematic view of a first film stack showing a light-transmitting region according to an embodiment of the present invention;
FIG. 5 is a schematic view of a second film stack structure showing a light-transmitting region according to an embodiment of the present invention;
FIG. 6 is a schematic view of a third film stack showing a light-transmitting region according to an embodiment of the present invention;
FIG. 7 is a schematic view of a fourth film stack showing a light-transmitting region according to an embodiment of the present invention;
FIG. 8 is a simulation diagram of efficiency curves of different cathode thicknesses corresponding to red sub-pixels of a light-transmitting region under different color points according to an embodiment of the present invention;
FIG. 9 is a simulation diagram of efficiency curves of different cathode thicknesses corresponding to green sub-pixels of a light-transmitting region under different color points according to an embodiment of the present invention;
fig. 10 is a simulation diagram of efficiency curves of different cathode thicknesses corresponding to blue sub-pixels of a display light-transmitting region under different color points according to an embodiment of the present invention.
Detailed Description
In the description of the present application, it should be understood that the terms "thickness," "upper," "lower," and the like refer to an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or the inclusion of a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other by another feature therebetween. Moreover, a first feature being "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply means that the first feature is less level than the second feature.
Referring to fig. 1, an embodiment of the present invention provides a display panel 100, including a display light-transmitting area 101 and a main display area 102 disposed outside the display light-transmitting area 101, where the display light-transmitting area 101 is a high light-transmitting area, and is used for placing optical elements such as a camera and an optical fingerprint sensor while displaying, and the main display area 102 is a conventional display area, and the light transmittance of the display light-transmitting area 101 is greater than that of the main display area 102. The area of the display light-transmitting area 101 is smaller than the area of the main display area 102. The shape of the display transparent area 101 includes, but is not limited to, any one of a circle, an ellipse, a square, and a diamond. In a specific embodiment, the main display area 102 may be disposed around the display light-transmitting area 101.
In the prior art, in order to increase the light transmittance of the display light-transmitting region 101, many manufacturers implement a method of reducing the Pixel density (PPI) of the display light-transmitting region 101, but as the PPI is reduced, the display brightness of the display light-transmitting region 101 is also reduced, so that in order to make the display light-transmitting region 101 reach the same display brightness requirement as the main display region 102, the current density of the sub-pixels of the display light-transmitting region 101 is increased, which results in a reduction in the lifetime of the sub-pixels of the display light-transmitting region 101. In the embodiment of the present invention, in the same display area, the number of the sub-pixels in the transparent display area 101 is the same as the number of the sub-pixels in the main display area 102, that is, the transparent display area 101 and the main display area 102 have the same pixel density, so that the difference between the display screen of the transparent display area 101 and the display screen of the main display area 102 can be reduced. To increase the light transmittance in the display light-transmitting area 101, the area of a sub-pixel in the display light-transmitting area 101 may be reduced, i.e., the area of a sub-pixel in the display light-transmitting area 101 is smaller than the area of a sub-pixel of the same color in the main display area 102.
Since the area of the sub-pixels in the display transparent area 101 is reduced, and the corresponding light emitting area is also reduced, in order to make the display transparent area 101 maintain the same brightness lifetime as the main display area 102, in the embodiment of the invention, the thickness of the cathode corresponding to the sub-pixels in the display transparent area 101 is adjusted, so that the thickness of the cathode corresponding to the sub-pixels in the display transparent area 101 is adjusted, and the microcavity effect is optimized, that is, the thickness of the cathode in the display transparent area 101 is different from the thickness of the cathode in the main display area 102, so as to improve the light emitting efficiency of the sub-pixels in the display transparent area 101.
Specifically, referring to fig. 3, fig. 3 is a schematic diagram of a film layer structure in a main display area of a display panel, a display panel 100 according to an embodiment of the present invention includes an array substrate 10 and an OLED light emitting device 20, the OLED light emitting device 20 is disposed on the array substrate 10, the array substrate 10 includes a plurality of pixel driving circuits distributed in an array, and the pixel driving circuits are used for driving the OLED light emitting device 20 to emit light. The OLED light emitting device 20 includes an anode 21, a light emitting functional layer, and a cathode 29 sequentially stacked on the array substrate 10. In some embodiments of the present invention, the light emitting functional layer includes a hole injecting layer 22, a hole transporting layer 23, a compensation layer 24, a light emitting layer 25, an electron injection control layer 26, an electron transporting layer 27, and an electron injecting layer 28 sequentially stacked on the anode 21. The cathode 29 is further provided with a light extraction layer 30 for improving the light emitting efficiency of the OLED device 20, and the light extraction layer 30 is covered with an encapsulation layer 40 for preventing the erosion of water and oxygen.
Referring to fig. 3, the light emitting layer 25 includes a first light emitting material layer 251, a second light emitting material layer 252, and a third light emitting material layer 253 with different light emitting colors, the compensation layer 24 includes a first compensation layer 241, a second compensation layer 242, and a third compensation layer 243, the first compensation layer 241 corresponds to the first light emitting material layer 251, the second compensation layer 242 corresponds to the second light emitting material layer 252, and the third compensation layer 243 corresponds to the third light emitting material layer 253, and the required thicknesses of the corresponding compensation layers 241, 242, 243 are not uniform due to the different light emitting spectra of the first light emitting material layer 251, the second light emitting material layer 252, and the third light emitting material layer 253.
Referring to fig. 2, fig. 2 is a schematic layout diagram of sub-pixels displaying a light transmission area according to an embodiment of the invention, the OLED light emitting device 20 includes a plurality of sub-pixels 201 located in the main display area 102 and the light transmission area 101, and the plurality of sub-pixels 201 includes a first sub-pixel 201A, a second sub-pixel 201B and a third sub-pixel 201C with different light emission colors. The first sub-pixel 201A includes the first luminescent material layer 251, the second sub-pixel 201B includes the second luminescent material layer 252, and the third sub-pixel 201C includes the third luminescent material layer 253.
As shown in fig. 3, in the embodiment of the present invention, the thicknesses of the cathodes 29 corresponding to the plurality of sub-pixels 201 located in the main display area 102 are all equal; as shown in fig. 4 to 6, fig. 4 to 6 show film lamination patterns of the display transparent area of the display panel in different embodiments, and the thickness of the cathode 29 corresponding to at least part of the sub-pixels 201 in the display transparent area 101 is smaller than the thickness of the cathode 29 corresponding to the sub-pixels 201 in the main display area 102. By performing differential design on the cathode thickness corresponding to the sub-pixel 201 of the display light-transmitting region 101 and the cathode thickness corresponding to the sub-pixel of the main display region 102, the thickness of a part of the sub-pixel 201 of the display light-transmitting region 101 is reduced, so that the light-emitting efficiency of the corresponding sub-pixel 201 of the display light-transmitting region 101 can be improved, and the service life of the sub-pixel 201 of the display light-transmitting region 101 can be further prolonged.
Specifically, the thickness of the cathode 29 corresponding to the first sub-pixel 201A located in the display light-transmitting region 101 is the same as the thickness of the cathode 29 corresponding to the first sub-pixel 201A located in the main display region 102, and the thickness of the cathode 29 corresponding to the second sub-pixel 201B and/or the third sub-pixel 201C located in the display light-transmitting region 101 is smaller than the thickness of the cathode 29 corresponding to the first sub-pixel 201A located in the main display region 102. The first sub-pixel 201A is one of red, green and blue sub-pixels, and the second sub-pixel 201B and the third sub-pixel 201C are the other one of red, green and blue sub-pixels.
Because the cathode is generally evaporated by co-evaporation (Common Mask) in the prior art, the thicknesses of the cathodes corresponding to the first sub-pixel 201A, the second sub-pixel 201B and the third sub-pixel 201C are the same, so that at most, the highest luminous efficiency can be ensured for one of the three sub-pixels, but the area of the sub-pixel 201 of the display transparent region 101 in the embodiment of the invention is reduced relative to the area of the sub-pixel 201 of the main display region 102, if the cathode thickness of the display transparent region 101 is still the same as the cathode thickness of the main display region 102, the service life of the sub-pixel of the display transparent region 101 is reduced, and therefore, the thickness of the sub-pixel 201 of at least one color of the display transparent region 101 in the embodiment of the invention is reduced, that is, the thickness of the second sub-pixel 201B and/or the third sub-pixel 201C is reduced, so that the microcavity effect of at least two sub-pixels in the display transparent region 101 is optimal, the highest luminous efficiency is maintained, and the overall luminous efficiency of the display transparent region 101 is better than the luminous efficiency of the main display transparent region 102, and the service life of the display transparent region 101 is prolonged.
The preparation process of the cathode 29 of the display panel 100 includes: the cathode is evaporated on the whole surface by utilizing a Common Mask, and then the cathodes corresponding to the second sub-pixel 201B and/or the third sub-pixel 201C in the light transmission area 101 are laser displayed by utilizing energy laser from the front surface (the direction from the cathode 29 to the anode 21) of the display panel 100, so that the thickness of the cathodes corresponding to the second sub-pixel 201B and/or the third sub-pixel 201C is reduced, the microcavity effect of the first sub-pixel 201A and the second sub-pixel 201B or the first sub-pixel 201A and the third sub-pixel 201C in the light transmission area 101 is displayed to be optimal, and the highest luminous efficiency is maintained.
The thickness of the cathode 29 corresponding to all the sub-pixels 201 of the main display area 102 and the thickness of the first sub-pixel 201A of the display transparent area 101 may be 15.5-16.5 nm, and may specifically be 16 nm; the thickness of the cathode 29 corresponding to the second sub-pixel 201B and/or the third sub-pixel 201C of the light-transmitting display area 101 may be 13-15 nm.
In the embodiment of the present invention, the first sub-pixel 201A may be a red sub-pixel, the second sub-pixel 201B may be a green sub-pixel, and the third sub-pixel 201C may be a blue sub-pixel.
Specifically, in one embodiment, as shown in fig. 4, the thickness of the cathode corresponding to the red sub-pixel of the display transparent region 101 may be kept the same as the thickness of the cathode of the main display region 102, and the thickness is 15.5-16.5 nm, so that the thicknesses of the cathodes corresponding to the green sub-pixel and the blue sub-pixel of the display transparent region 101 are reduced, and the thickness is 13-15 nm.
In other embodiments, as shown in fig. 5, the thickness of the cathode corresponding to the blue sub-pixel of the display transparent region 101 may be kept to be 15.5-16.5 nm as the thickness of the cathode of the main display region 102, and the thickness of the cathode corresponding to the red sub-pixel and the green sub-pixel of the display transparent region 101 may be reduced to be 13-15 nm.
In other embodiments, as shown in fig. 6, the thickness of the cathode corresponding to the green sub-pixel of the display transparent region 101 may be kept to be 15.5-16.5 nm as the thickness of the cathode of the main display region 102, and the thickness of the cathode corresponding to the red sub-pixel and the blue sub-pixel of the display transparent region 101 may be reduced to be 13-15 nm.
Referring to fig. 7, in some embodiments, the thickness of the cathode corresponding to the third sub-pixel 201C in the display transparent region 101 is further smaller than the thickness of the cathode corresponding to the second sub-pixel 201B in the display transparent region 101. Specifically, the thicknesses of the cathodes corresponding to the first sub-pixel 201A, the second sub-pixel 201B, and the third sub-pixel 201C in the light-transmitting region 101 are different, and the thicknesses of the cathodes corresponding to the first sub-pixel 201A, the thicknesses of the cathodes corresponding to the second sub-pixel 201B, and the thicknesses of the cathodes corresponding to the third sub-pixel 201C are sequentially reduced, so that the microcavity effect of the red, green, and blue sub-pixels in the light-transmitting region 101 can be optimized, and the light-emitting efficiency of the three sub-pixels can be optimized. In the display transparent region 101, the cathode thickness corresponding to the first sub-pixel 201A is 15.5-16.5 nm, the cathode thickness corresponding to the second sub-pixel 201B is 13-15 nm, and the cathode thickness corresponding to the blue sub-pixel is 13-15 nm.
Referring to fig. 8 to 10, fig. 8 to 10 are graphs showing the efficiency of different cathode thicknesses corresponding to red, green and blue sub-pixels in the light transmission region at different color points, wherein the ordinate CE is the luminous efficiency, and the abscissa Rx/Gx/By is the x color point of the red sub-pixel/green sub-pixel and the y color point of the blue sub-pixel (the x color point of R/G has a large influence on the R/G efficiency; the y color point of B has a large influence on the B efficiency), and as can be seen from the simulation results of fig. 8 to 9, the efficiency of the red sub-pixel, the green sub-pixel and the blue sub-pixel increases with the thickness of the cathode, but the optimal thickness of the cathode corresponding to the sub-pixels of different colors is different, so that the cathode corresponding to the sub-pixels of different colors in the light transmission region needs to be designed differently.
Referring to fig. 2, to further increase the light transmittance of the display light-transmitting region 101, the cathode 29 further includes a plurality of openings 291, and the openings 291 are located between the adjacent sub-pixels 201 in the display light-transmitting region 101. The openings 291 may penetrate the upper and lower surfaces of the cathode 29, and the openings 291 may be patterned by laser. The pattern of openings 291 includes, but is not limited to, circular, rectangular, diamond, polygonal, and the like. In the embodiment of the present invention, the pattern of the openings 291 is regular octagon.
With continued reference to fig. 2, the sub-pixels 201 of the main display area 102 and the display transparent area 101 are arranged in the same manner. The arrangement mode mentioned in the embodiment of the invention comprises arrangement rules, arrangement distances and the like of each sub-pixel, but does not comprise the area size and the shape of each sub-pixel. The main display area 102 and the sub-pixels 201 in the display transparent area 101 may all adopt a pentile arrangement, taking the arrangement of the sub-pixels 201 in the display transparent area 101 as an example, the sub-pixels 201 in adjacent rows are arranged in a staggered manner, the sub-pixels 201 in adjacent columns are arranged in a staggered manner, the plurality of sub-pixels 201 include first sub-pixels 201A, second sub-pixels 201B and third sub-pixels 201C with different light emitting colors, the first sub-pixels 201A and the third sub-pixels 201C are arranged in the same row and are alternately arranged in sequence, the first sub-pixels 201A and the third sub-pixels 201C are distributed in alternate rows together with the second sub-pixels 201B, the first sub-pixels 201A and the third sub-pixels 201C are arranged in the same row and are alternately arranged in sequence, and the first sub-pixels 201A and the third sub-pixels 201C are distributed in alternate rows together with the second sub-pixels 201B.
The first sub-pixel 201A, the second sub-pixel 201B and the third sub-pixel 201C of the transparent display region may all have a circular shape. Since the light emitting efficiency of the blue sub-pixel is lower than that of the red and green sub-pixels, the area of the third sub-pixel 201C may be larger than that of the first sub-pixel 201A and the second sub-pixel 201B.
The sub-pixels 201 in the display transparent region 101 and the pixel driving circuits for driving the sub-pixels 201 to emit light may be arranged in different regions, and the pixel driving circuits for driving the sub-pixels 201 in the display transparent region 101 to emit light may be arranged around the display transparent region 101, i.e. the pixel driving circuits for driving the sub-pixels 201 in the display transparent region 101 to emit light are arranged outside the display transparent region 101, so as to enhance the light transmittance of the display transparent region 101. The sub-pixels 201 in the display transparent area 101 and the pixel driving circuit for driving the sub-pixels to emit light can be electrically connected through transparent wires, specifically, the anode 21 of the sub-pixels 201 in the display transparent area 101 is electrically connected with the transparent wires.
One of the pixel driving circuits may simultaneously drive the plurality of sub-pixels 201 of the display light-transmitting region 101 to emit light, for example, one of the pixel driving circuits may simultaneously drive the 4 green sub-pixels to emit light, or simultaneously drive the 2 red sub-pixels to emit light, or simultaneously drive the 2 blue sub-pixels to emit light.
Since the pixel density of the display transparent region 102 is kept consistent with the pixel density of the main display region 102, in order to maintain the transmittance of the display transparent region 102, the area of the anode 21 corresponding to the sub-pixel 201 of the display transparent region 101 needs to be reduced, that is, the area of the anode 21 corresponding to the sub-pixel 201 of the display transparent region 101 is smaller than the area of the anode 21 corresponding to the sub-pixel 201 of the main display region 102.
The embodiment of the invention further provides a display device, which includes the display panel 100 in any of the above embodiments and an optical element, where the optical element is located on a backlight side of the display panel 100 and is disposed corresponding to the display light-transmitting area 101 of the display panel 100. The optical element comprises, but is not limited to, a device which needs to sense external light such as a camera, an optical fingerprint sensor and the like.
The display panel and the display device provided by the embodiment of the invention comprise a display light-transmitting area and a main display area arranged outside the display light-transmitting area, wherein the display panel comprises an array substrate and an OLED light-emitting device arranged on the array substrate, and the OLED light-emitting device comprises an anode, a light-emitting functional layer and a cathode which are sequentially laminated on the array substrate; the thickness of the cathode in the display light-transmitting area is different from that of the cathode in the main display area. The cathode thickness of the display light-transmitting area and the cathode thickness of the main display area are subjected to differential design, so that the microcavity cavity length of the sub-pixels of the display light-transmitting area is optimal, the luminous efficiency of the sub-pixels of the display light-transmitting area is improved, and the brightness life of the display light-transmitting area is improved.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for parts of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
The display panel and the display device provided by the embodiments of the present invention are described in detail, and specific examples are applied to illustrate the principles and the embodiments of the present invention, and the description of the above embodiments is only used to help understand the technical solution and the core idea of the present invention; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A display panel comprising a display light transmission area and a main display area disposed outside the display light transmission area, the display panel comprising:
an array substrate;
the OLED light-emitting device is arranged on the array substrate and comprises an anode, a light-emitting functional layer and a cathode which are sequentially laminated on the array substrate; wherein,,
the display light transmission area has the same pixel density as the main display area;
the OLED light-emitting device comprises a plurality of first sub-pixels, a plurality of second sub-pixels and a plurality of third sub-pixels, wherein the first sub-pixels, the second sub-pixels and the third sub-pixels are positioned in the main display area and the display light-transmitting area, the light-emitting colors of the first sub-pixels, the second sub-pixels and the third sub-pixels are different, the first sub-pixels are blue sub-pixels, the second sub-pixels are one of red sub-pixels and green sub-pixels, the third sub-pixels are the other one of the red sub-pixels and the green sub-pixels, the thicknesses of cathodes corresponding to the sub-pixels positioned in the main display area are equal, the thicknesses of cathodes corresponding to the first sub-pixels positioned in the display light-transmitting area are the same as the thicknesses of cathodes corresponding to the main display area, and the thicknesses of cathodes corresponding to the second sub-pixels and the third sub-pixels positioned in the display light-transmitting area are smaller than the thicknesses of cathodes corresponding to the main display area.
2. The display panel according to claim 1, wherein the thickness of the cathode corresponding to the second sub-pixel and/or the third sub-pixel in the display light-transmitting area is 13-15 nm.
3. The display panel of claim 1, wherein a thickness of the cathode corresponding to the third sub-pixel located in the display light-transmitting region is smaller than a thickness of the cathode corresponding to the second sub-pixel located in the display light-transmitting region.
4. The display panel according to claim 3, wherein the thickness of the cathode corresponding to the third sub-pixel located in the display light-transmitting area is 9 to 13 nm, and the thickness of the cathode corresponding to the second sub-pixel located in the display light-transmitting area is 13 to 15 nm.
5. The display panel of claim 1, wherein the cathode includes a plurality of openings between adjacent ones of the subpixels within the display pass-through region.
6. The display panel of claim 1, wherein the light transmittance of the display light transmission area is greater than the light transmittance of the main display area.
7. The display panel of claim 6, wherein an area of the anode corresponding to a sub-pixel of the display light-transmitting region is smaller than an area of the anode corresponding to a sub-pixel of the main display region.
8. A display device, comprising the display panel according to any one of claims 1 to 7, and an optical element located on a backlight side of the display panel, wherein the optical element is disposed corresponding to a display light-transmitting region of the display panel.
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